Wavelength And Frequency

Let us analyze the two statements:

Statement (A): In VIBGYOR, wavelength increases from violet to red. This statement is correct. In the visible spectrum (VIBGYOR: Violet, Indigo, Blue, Green, Yellow, Orange, Red), the wavelength of light increases as we move from violet (shortest wavelength) to red (longest wavelength).

Statement (B): In VIBGYOR, refractive index increases from violet to red. This statement is incorrect. The refractive index of a medium depends on the wavelength of light, and it decreases as the wavelength increases. Since violet light has a shorter wavelength than red light, the refractive index is higher for violet light and lower for red light.

Final Answer: The correct answer is .

In the VIBGYOR spectrum (visible light spectrum), the wavelength indeed increases from violet to red, which is true. Violet light has the shortest wavelength, while red light has the longest wavelength.
However, the refractive index generally decreases with increasing wavelength in most media. This means that the refractive index is higher for violet light and lower for red light.

The correct option is (A): Only (a) is true